Seven people were killed, two were injured as a result of gas poisoning at a paper factory in the southern Chinese province of Guangdong late on Friday, China Central Television reported.
Firefighters who arrived at the scene of the incident were able to get all the workers out of the tank alive.
READ MORE: At Least 14 People Injured by Building Collapse in Eastern China — Authorities
The workers were sent to a hospital. However, despite the efforts of doctors, seven people later died, while two are in stable condition. An investigation into the incident is underway.
According to the investigation, nine workers were locked in the wastewater control tank, but the reason why they were in there is not yet known.
On 16 February, about 14 people were reportedly injured as a result of the collapse of a five-storey residential building in the eastern Chinese city of Fuzhou, Fujian Province.